1 files changed, 152 insertions, 0 deletions
diff --git a/tools/test/stress2/misc/kevent18.sh b/tools/test/stress2/misc/kevent18.sh
new file mode 100755
index 000000000000..1492c49e2921
--- /dev/null
+++ b/tools/test/stress2/misc/kevent18.sh
@@ -0,0 +1,152 @@
+#!/bin/sh
+
+#
+# Copyright (c) 2025 Peter Holm <pho@FreeBSD.org>
+#
+# SPDX-License-Identifier: BSD-2-Clause
+#
+
+# A kqueuex(KQUEUE_CPONFORK) test scenario
+
+# Sleeping thread seen in WiP code:
+# https://people.freebsd.org/~pho/stress/log/log0615.txt
+
+. ../default.cfg
+
+[ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1
+ulimit -k 5000 || { echo FAIL; exit 1; }
+
+odir=`pwd`
+prog=$(basename "$0" .sh)
+
+cd /tmp
+sed '1,/^EOF/d' < $odir/$0 > $prog.c
+mycc -o $prog -Wall -Wextra -O2 -g $prog.c -lpthread || exit 1
+rm -f $prog.c
+cd $odir
+
+mount | grep "on $mntpoint " | grep -q md$mdstart && umount -f $mntpoint
+mdconfig -l | grep -q $mdstart && mdconfig -d -u $mdstart
+
+mdconfig -a -t swap -s 2g -u $mdstart
+newfs $newfs_flags md$mdstart > /dev/null
+mount /dev/md$mdstart $mntpoint
+chmod 777 $mntpoint
+
+su $testuser -c "(cd $mntpoint; /tmp/$prog)" &
+for i in `jot 99`; do
+	sleep 1
+	kill -0 $! 2>/dev/null || break
+done
+pkill $prog
+wait
+umount -f $mntpoint
+
+while mount | grep -q $mntpoint; do
+	umount $mntpoint || sleep 1
+done
+mdconfig -d -u $mdstart
+rm -f /tmp/$prog
+
+exit 0
+EOF
+#include <sys/types.h>
+#include <sys/event.h>
+#include <sys/mman.h>
+#include <sys/wait.h>
+
+#include <err.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <pthread.h>
+#include <sched.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#define PARALLEL 64
+
+static int fd;
+static char path[80];
+
+static void *
+spin(void *arg __unused)
+{
+	int i;
+
+	for (i= 0;; i++) {
+		snprintf(path, sizeof(path), "file.%06d.%d", getpid(), i);
+		fd = open(path, O_CREAT | O_TRUNC | O_RDWR, 0622);
+		if (fd == -1 && errno == ENOTDIR)
+			break;
+		if (fd == -1)
+			err(1, "open(%s)", path);
+		close(fd);
+		fd = 0;
+		unlink(path);
+	}
+	fprintf(stderr, "spin loops: %d\n", i + 1);
+	return (NULL);
+}
+
+static void *
+test(void *arg __unused)
+{
+	struct kevent ev;
+	struct timespec ts;
+	pid_t pid;
+	int i, kq, n;
+
+	for (i = 0; i < 500000; i++) {
+		if ((kq = kqueuex(KQUEUE_CPONFORK)) < 0)
+			err(1, "kqueueex(KQUEUE_CPONFORK)");
+
+		n = 0;
+		memset(&ev, 0, sizeof(ev));
+		EV_SET(&ev, fd, EVFILT_VNODE, EV_ADD | EV_ENABLE | EV_CLEAR,
+			NOTE_DELETE|NOTE_RENAME|NOTE_EXTEND, 0, 0);
+		n++;
+
+		if ((pid = fork()) == 0) {
+			kevent(kq, &ev, n, NULL, 0, NULL);
+			_exit(0);
+		}
+		if (waitpid(pid, NULL, 0) != pid)
+			err(1, "waitpid(%d)", pid);
+
+		kevent(kq, &ev, n, NULL, 0, NULL);
+		memset(&ev, 0, sizeof(ev));
+		ts.tv_sec  = 0;
+		ts.tv_nsec = 1000000;
+		if ((n = kevent(kq, NULL, 0, &ev, 1, &ts)) == -1)
+			err(1, "kevent()");
+
+		close(kq);
+	}
+	return (NULL);
+}
+
+int
+main(void)
+{
+	pthread_t cp[PARALLEL], sp;
+	int e, i;
+
+	if ((e = pthread_create(&sp, NULL, spin, NULL)) != 0)
+		errc(1, e, "pthread_create");
+
+	for (i = 0; i < PARALLEL; i++) {
+		if ((e = pthread_create(&cp[i], NULL, test, NULL)) != 0)
+			errc(1, e, "pthread_create");
+	}
+
+	for (i = 0; i < PARALLEL; i++)
+		pthread_join(cp[i], NULL);
+	pthread_join(sp, NULL);
+
+	close(fd);
+
+	return (0);
+}